fix: avoid Python name mangling in trampoline prefix for underscore-prefixed classes#499
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boxed merged 1 commit intoboxed:mainfrom Apr 16, 2026
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…refixed classes
Use '_mutmut_' prefix instead of '_{class_name}_' to prevent
identifiers starting with '__' inside class bodies, which Python
mangles and causes NameError at import time.
Fixes boxed#498
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Update Known Issue → Resolved Issue in MUTANTS.md. Fix merged in boxed/mutmut#499 (2026-04-16): trampoline prefix changed to _mutmut_ to avoid Python name mangling on underscore-prefixed classes. Retain legacy patch command for builds that predate the fix.
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Use 'mutmut' prefix instead of '{class_name}' to prevent
identifiers starting with '__' inside class bodies, which Python
mangles and causes NameError at import time.
Fixes #498